In a full-time backup role to LeSean McCoy, Gillislee was uber-efficient last season, earning 5.7 yards per carry and eight touchdowns on 101 totes. The 26-year-old flashed speed and elusiveness on the edge, along with a willingness and ability to pound the ball between the tackles despite being listed at 219 pounds.

The addition of Gillislee could slam the door closed on a return for power back LeGarrette Blount in Foxborough.

For the Bills, losing another promising player to the Patriots, after utilizing what many believed was a too-low tender, will go down as another strike against general manager Doug Whaley among frustrated Buffalo fans.